feat: remove stale ONLINE_PRESENCE contact keys in redis (#9558)

50% of Redis memory size comes from ONLINE_PRESENCE keys. This PR adds a
periodic job to remove stale keys from all accounts.

app/jobs/internal/process_stale_redis_keys_job.rb

@@ -0,0 +1,11 @@
+# housekeeping
+# remove contact inboxes that does not have any conversations
+# and are older than 3 months
+
+class Internal::ProcessStaleRedisKeysJob < ApplicationJob
+  queue_as :low
+
+  def perform(account)
+    Internal::RemoveStaleRedisKeysService.new(account_id: account.id).perform
+  end
+end